what is the meaning literally of "have" in present perfect tense. For example, they have helped him. how this sentence processed in any native's brain.

Question

anonymous · Answer

Some time in the past help was given to him by them.

anonymous · Answer

Have in perfect past tense is simply a present tense form of "to have" as an auxiliary verb in support to a past participle of the verb. Thus, have is a VERB, 'to have' done something. To experience, I want to say? It's simply a supporting word for the following main verb.

In your example, the statement itself is naturally past tense (they have helped him = he was helped in the past).

Sorry if this is confusing! There's not much in technicality to it past grammar issues; there's no other meaning besides it supporting a larger one to the statement!